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xrdp-proprietary/sesman/session.c

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/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005-2006
*/
/**
*
* @file session.c
* @brief Session management code
* @author Jay Sorg, Simone Fedele
*
*/
#include "sesman.h"
extern unsigned char g_fixedkey[8];
extern struct config_sesman g_cfg; /* config.h */
struct session_chain* g_sessions;
int g_session_count;
/******************************************************************************/
struct session_item* DEFAULT_CC
session_get_bydata(char* name, int width, int height, int bpp)
{
struct session_chain* tmp;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp=g_sessions;
while (tmp != 0)
{
if (g_strncmp(name, tmp->item->name, 255) == 0 &&
tmp->item->width == width &&
tmp->item->height == height &&
tmp->item->bpp == bpp)
{
/*THREAD-FIX release chain lock */
lock_chain_release();
return tmp->item;
}
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
/******************************************************************************/
/**
*
* @brief checks if there's a server running on a display
* @param display the display to check
* @return 0 if there isn't a display running, nonzero otherwise
*
*/
static int DEFAULT_CC
x_server_running(int display)
{
char text[256];
int x_running;
int sck;
g_sprintf(text, "/tmp/.X11-unix/X%d", display);
x_running = g_file_exist(text);
if (!x_running)
{
g_sprintf(text, "/tmp/.X%d-lock", display);
x_running = g_file_exist(text);
}
if (!x_running) /* check 59xx */
{
sck = g_tcp_socket();
g_sprintf(text, "59%2.2d", display);
x_running = g_tcp_bind(sck, text);
g_tcp_close(sck);
}
if (!x_running) /* check 60xx */
{
sck = g_tcp_socket();
g_sprintf(text, "60%2.2d", display);
x_running = g_tcp_bind(sck, text);
g_tcp_close(sck);
}
if (!x_running) /* check 62xx */
{
sck = g_tcp_socket();
g_sprintf(text, "62%2.2d", display);
x_running = g_tcp_bind(sck, text);
g_tcp_close(sck);
}
return x_running;
}
/******************************************************************************/
int DEFAULT_CC
session_start(int width, int height, int bpp, char* username, char* password,
long data, unsigned char type)
{
int display;
int pid;
int wmpid;
int xpid;
char geometry[32];
char depth[32];
char screen[32];
char cur_dir[256];
char text[256];
char passwd_file[256];
struct session_chain* temp;
/*THREAD-FIX lock to control g_session_count*/
lock_chain_acquire();
/* check to limit concurrent sessions */
if (g_session_count >= g_cfg.sess.max_sessions)
{
/*THREAD-FIX unlock chain*/
lock_chain_release();
log_message(LOG_LEVEL_INFO, "max concurrent session limit exceeded. login \
for user %s denied", username);
return 0;
}
/*THREAD-FIX unlock chain*/
lock_chain_release();
temp = (struct session_chain*)g_malloc(sizeof(struct session_chain), 0);
if (temp == 0)
{
log_message(LOG_LEVEL_ERROR, "cannot create new chain element - user %s",
username);
return 0;
}
temp->item = (struct session_item*)g_malloc(sizeof(struct session_item), 0);
if (temp->item == 0)
{
g_free(temp);
log_message(LOG_LEVEL_ERROR, "cannot create new session item - user %s",
username);
return 0;
}
g_get_current_dir(cur_dir, 255);
display = 10;
/*while (x_server_running(display) && display < 50)*/
/* we search for a free display up to max_sessions */
/* we should need no more displays than this */
/* block all the threads running to enable forking */
lock_fork_request();
while (x_server_running(display))
{
display++;
if ((display - 10) > g_cfg.sess.max_sessions || display >= 50)
{
return 0;
}
}
wmpid = 0;
pid = g_fork();
if (pid == -1)
{
}
else if (pid == 0) /* child */
{
g_unset_signals();
auth_start_session(data, display);
g_sprintf(geometry, "%dx%d", width, height);
g_sprintf(depth, "%d", bpp);
g_sprintf(screen, ":%d", display);
wmpid = g_fork();
if (wmpid == -1)
{
}
else if (wmpid == 0) /* child */
{
/* give X a bit to start */
g_sleep(1000);
env_set_user(username, 0, display);
if (x_server_running(display))
{
auth_set_env(data);
/* try to execute user window manager if enabled */
if (g_cfg.enable_user_wm)
{
g_sprintf(text,"%s/%s", g_getenv("HOME"), g_cfg.user_wm);
if (g_file_exist(text))
{
g_execlp3(text, g_cfg.user_wm, 0);
}
}
/* if we're here something happened to g_execlp3
so we try running the default window manager */
g_sprintf(text, "%s/%s", cur_dir, g_cfg.default_wm);
g_execlp3(text, g_cfg.default_wm, 0);
/* still a problem starting window manager just start xterm */
g_execlp3("xterm", "xterm", 0);
/* should not get here */
}
log_message(LOG_LEVEL_ALWAYS,"error starting window manager %s - pid %d",
username, g_getpid());
g_exit(0);
}
else /* parent */
{
xpid = g_fork();
if (xpid == -1)
{
}
else if (xpid == 0) /* child */
{
env_set_user(username, passwd_file, display);
env_check_password_file(passwd_file, password);
if (type == SESMAN_SESSION_TYPE_XVNC)
{
g_execlp13("Xvnc", "Xvnc", screen, "-geometry", geometry,
"-depth", depth, "-bs", "-ac", "-rfbauth", passwd_file,
0, 0);
}
else if (type == SESMAN_SESSION_TYPE_XRDP)
{
g_execlp11("X11rdp", "X11rdp", screen, "-geometry", geometry,
"-depth", depth, "-bs", "-ac", 0, 0);
}
else
{
log_message(LOG_LEVEL_ALWAYS, "bad session type - user %s - pid %d",
username, g_getpid());
g_exit(1);
}
/* should not get here */
log_message(LOG_LEVEL_ALWAYS,"error doing execve (%s) for user %s - pid %d",
username, g_getpid());
g_exit(1);
}
else /* parent */
{
g_waitpid(wmpid);
g_sigterm(xpid);
g_sigterm(wmpid);
g_sleep(1000);
auth_end(data);
g_exit(0);
}
}
}
else /* parent */
{
/* let the other threads go on */
lock_fork_release();
temp->item->pid = pid;
temp->item->display = display;
temp->item->width = width;
temp->item->height = height;
temp->item->bpp = bpp;
temp->item->data = data;
g_strncpy(temp->item->name, username, 255);
temp->item->connect_time = g_time1();
temp->item->disconnect_time = 0;
temp->item->idle_time = 0;
temp->item->type=type;
temp->item->status=SESMAN_SESSION_STATUS_ACTIVE;
/*THREAD-FIX lock the chain*/
lock_chain_acquire();
temp->next=g_sessions;
g_sessions=temp;
g_session_count++;
/*THERAD-FIX free the chain*/
lock_chain_release();
g_sleep(5000);
}
return display;
}
/*
SESMAN_SESSION_TYPE_XRDP 1
SESMAN_SESSION_TYPE_XVNC 2
SESMAN_SESSION_STATUS_ACTIVE 1
SESMAN_SESSION_STATUS_IDLE 2
SESMAN_SESSION_STATUS_DISCONNECTED 3
struct session_item
{
char name[256];
int pid;
int display;
int width;
int height;
int bpp;
long data;
/ *
unsigned char status;
unsigned char type;
* /
/ *
time_t connect_time;
time_t disconnect_time;
time_t idle_time;
* /
};
struct session_chain
{
struct session_chain* next;
struct session_item* item;
};
*/
/******************************************************************************/
int DEFAULT_CC
session_kill(int pid)
{
struct session_chain* tmp;
struct session_chain* prev;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp=g_sessions;
prev=0;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(LOG_LEVEL_ERROR, "session descriptor for pid %d is null!",
pid);
if (prev == 0)
{
/* prev does no exist, so it's the first element - so we set
g_sessions */
g_sessions = tmp->next;
}
else
{
prev->next = tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return SESMAN_SESSION_KILL_NULLITEM;
}
if (tmp->item->pid == pid)
{
/* deleting the session */
log_message(LOG_LEVEL_INFO, "session %d - user %s - terminated",
tmp->item->pid, tmp->item->name);
g_free(tmp->item);
if (prev == 0)
{
/* prev does no exist, so it's the first element - so we set
g_sessions */
g_sessions = tmp->next;
}
else
{
prev->next = tmp->next;
}
g_free(tmp);
g_session_count--;
/*THREAD-FIX release chain lock */
lock_chain_release();
return SESMAN_SESSION_KILL_OK;
}
/* go on */
prev = tmp;
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return SESMAN_SESSION_KILL_NOTFOUND;
}
/******************************************************************************/
struct session_item* DEFAULT_CC
session_get_bypid(int pid)
{
struct session_chain* tmp;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp = g_sessions;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(LOG_LEVEL_ERROR, "session descriptor for pid %d is null!",
pid);
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
if (tmp->item->pid == pid)
{
/*THREAD-FIX release chain lock */
lock_chain_release();
return tmp->item;
}
/* go on */
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
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